Q: I think you are great on "The West
Wing"! Heres my current problem, its in advanced
finite math (Im a high school senior): At the height of the
Beatles’ popularity, it was estimated that every popular
music station played their music 40% of the time. If you tuned
through 10 such stations at any given moment, what is the
probability that at least *one* of the stations would be playing a
Beatles song? Thanks!

Danica
Answers:A probability question! Okay,
let’s call "x" the probability that
"at least one of the 10 stations would be playing a Beatles
song at that moment." That’s what
we’re asked to find. Then let’s call
"y" the probability that "none of those 10 stations
would be playing a Beatles song at that moment." Notice that
x+y = 1.... Okay, so we’ll now determine the value
of "y" which is much easier than going through all the
necessary calculations required to determine "x"
directly. This is a common strategy in probability....